Coating roll



DeC- 6, 1966 H.J. vAcHoN ETAL 3,289,631

GOATING ROLL 2 Sheets-Sheet l Filed Jan. 28, 1964 Dec- 6 1966 HJ. vAcHONETAL 3,289,631

GOATING ROLL Filed Jan. 28, 1964 2 Sheets-Sheet 2 00 l am United StatesPatent O 3,289,631 COATING ROLL Hubert J. Vachon, Lynn, and Frank H. G.Lester, Beverly, Mass., assignors to Boston Machine Works Company, Lynn,Mass., a corporation of Massachusetts Filed Jan. 28, 1964, Ser. No.340,759 1 Claim. (Cl. 118-244) This invention relates to a coating rollfor applying a lil-m of liquid cement to objects having a varyingthickness, su-ch .as some shoe soles, and more particularly to themargin of an insole the edge of which m-ay vary in thickness from 1;/32to 1A" or more. Some types of womens shoes include an insole consistingof a flexible layer of artificial leather extending the full length ofthe shoe and a rigid member of pressed berboard cemented to the underside of the `heel and shank portions of the flexible layer. The 'heelportion of such an insole is the .portion of Igreatest thickness, theshank portion being longitudinally and transversely arched with skivedmar- -gins resulting in thin side edges. Prior to 4assembly such insoleswith uppers, a band of liquid cement is applied along the entire marginof the bottom face of the insole. This is usually done by means of aknurled roll which is power-driven and which dips into a pool of liquidcement. This is a rapid operation, and difficulty has been experiencedin applying a uniform band of cement to the shank portion of the insole,especially where the shank portion meets the ball portion of the insole.According to the invention, a coating roll is provided the surface ofwhich yields locally to pressure, the yielding being resilient. By theuse of such a roll, as hereinafter described, the band of cement isapplied quickly and uniformly.

For a more complete understan-ding of the invention, reference may behad to the following descripti-on thereof, and to the drawings, of whichFIGURE 1 is a plan view of coating apparatus including a roll embodyingthe invention;

FIGURE 2 is an elevational view of the same, a portion 'being brokenaway;

FIGURE 3 -is a section on the line 3-3 of FIGURE 2;

FIGURE 4 is a fragmentary side elevation of an insole;

FIGURE 5 is a fragmentary plan view of the insole shown in FIGURE 4;

FIGURE 6 is a fragmentary sectional view of the machine showing a rollin operation, the knurling being different from that shown in FIGURE 2;

FIGURE 7 is a sectional view on a larger scale, of the roll shown inFIGURE 6;

FIGURE 8 is an elevational view, partly broken away, of two units of amodified form of roll; and

FIGURE 9 is a partially exploded view of units of another modied form ofroll.

The invention is embodied in an improved cementing roll 10 which isadapted to be mounted on a driven shaft 12 in a -cementing machine. Theroll dips into a pool 14 of liquid cement maintained in a trough 16 by apum-p which operates while the shaft 12 is turning. When the machinestops, the cement drains from the trough 16. The end plate 18 of thetrough is readily removable t0 permit a roll 10 to -be mounted on theshaft or removed therefrom. Above the roll 10` is a press roll 20mounted on a driven shaft 22, the rolls 10 and 20v being rotated atequal peripheral speeds during oper-ation. The press -roll 20 isnormally spaced abo-ve the roll 10 but is swung down into operativeengagement with a work piece W to press the latter against the roll 10las the work piece is fed between the rolls by rotation of both rolls.The `driving means for the two shafts and the depressing means for thepress roll 20 are well known parts of a cementing machine and are notillustrated on the drawings.

The improved cementing roll 10 was developed for the purpose of applyinga uniform band of liquid cement to the entire margin on the bottom of anins-ole such as `is illustrated in FIGURE 4 of the drawings, part of theball portion of the insole being broken olf to illustrate the remainderof the insole on a larger scale within the boundaries of the drawing.The insole W as shown in FIG- URE 4 is a preformed insole ready to belasted without subsequent forming. This simplifies the lastingoperation. The insole consists of two parts, a rigid portion 24 whichextends from the rear end of the heel to the forward end of the shankportion of the insole and is overlaid by a relatively flexible layer 26which is thinner and which extends for the full length of the insole. Inshaping the Imember 24, the shank portion thereof is skived on bothmargins of its under face as indicated at 28 in FIGURE 5. The shankportion is also transversely curved as indicated in FIGURES 2 and `6.

In practice, an insole W is inserted right side -up between the rolls 10and 20 so that the edge of the insole, preferably at the toe end, bearsagainst a fixed guide finger 30. The roll 20 is then swung down to bearon the margin of the insole and to press it against the coating roll 10,both rolls being driven at equal peripheral speeds. The rolls feed themargin lof the iinsole along as it is guided by the operator and thecoating roll 10 brings up cement from the pool 14 and applies it to theunder face of the insole W along the margin thereof. When the coatinghas been applied to the entire margin of the work piece, the roll 20 israised and the next work piece is inserted against the guide 30. Inorder to overcome the difficulty which has been experienced in applyinga uniform coating of cement to the portions of the margin of the insolewhere the shank portion meets the ball portion, the roll 10 is made withyielding segments as illustrated, for example, in FIGURE 7. As thereinshown, the roll 10 has a hollow cylindrical core 40 adapted to fit outhe end 'portion of the drive shaft 12. The core 40 has end flanges 42and 44, the latter being preferably removable so that the parts of theroll can be disassembled easily. Between the flanges 42 and 44 a deeplayer 46 of soft resilient material, such as spon-ge rubber, plasticfoam, or the like is fitted around the core 40. This soft layer iscylindrical in shape, the outer surface being fitted by a series ofrigid rings S0 which are in side to side engagement with each other andwith the end flanges 42 and 44. Each ring has a cylindrical inner facefitting against the outer face of the soft layer 46, two parallel .planefaces which are in face to face contact with the next adjacent rings,and a knurled circumferential outer surface. When an insole is beingoperated on and the point A at the juncture of the ball and shankportions of the insole reaches the coating roll 10, the coating rolleasily adjusts itself to the sudden change from the relatively thin ballportion of the insole which is uniform in thickness to the relativelythick shank portion of the insole which is skived. This is made possibleby the rings 50 which can yield individually in response to unevenpressure by the margin of the insole which is being coated by the roll.To key 4the roll 10 to the drive shaft 12, it is provided near one endwith a transverse pin 52 which extends diametrically across the bore ofthe roll. This pin enters a slot 54 in the end of the drive shaft 12.When the machine is not in operati-on, there is no cement 14 in Ithetrough 16 so that the end plate 18 can -readily be removed, thuspermitting the withdrawal of the roll 10 from the drive shaft 12. Theend flange 44 can then be unscrewed or otherwise detached from the core40 so that the various parts of t-he roll can be disassembled forcleaning. The plane faces of the several rings are accurately ground sothat when the rings are assembled, no cement can get in between them.Since the rings must be slidable upon one another so as to be able toyield individually downward, the radial thickness of each is made smallso that the area of interfacial contact between successive rings will beat a minimum. This minimizes frictional resistance to the individualyielding movements of the rings and also provides room for a cushionmember 46 of substantial thickness.

To control the quantity of ce-ment which is brought by the roll 10 intocontact with Ithe work piece, the roll is mounted so that its Irisingside which carries the cement up from the pool is touched or nearlytouched by a lip 56 of the trough 16. To avoid unevenness in the cementlm when some of the rings 50 are depressed by the work piece passingunder the press roll 20, the roll 10 is mounted with its axis on a levelwith the lip 56. The lip, instead of being the usual sharp edge, islmade with a vertical -at so that When one or more of the rings 50 aredepressed, the clearance between them and the lip is not changed, thevertical width of the flat being as great as the maximum depression ofany of the rings 50.

The knurls on the circumference of the roll lmay be of diiferent degreesof coarseness or tineness according to the character and consistency ofthe cement, which is to be carried up by this surface. In some cases, itmay be desirable to carry up extra quantities of cement. This can bedone by providing circumferential grooves 60 in the surface of the roll.These grooves may be formed by cutting a circumferential recess in eachof the rings 62 as shown in FIGURE 8.

Another way of making a roll with circumferential .grooves isillustrated in FIGURlE 9, successive r-ings `50 being spaced by spacerrin-gs 64 which h-ave an exterior diameter less `than that of the rings50. The spacer rings -may be of any convenient material, such assynthetic resin consisting of a tetrauoroethylene polymer known asTeflon. The spacer rings 64 may also be of metal or any other syntheticres-in which is not alected by contact with the cement which is t-o beused in the machine.

We claim:

In a machine for applying liquid cement to insoles, a trough adapted tohold a pool of liquid cement, said trough having an inwardly projectinglip at one side thereof, a cementing roll rotatably mounted in saidtrough to rotate about a horizontal axis parallel to said lip and on alevel therewith, said roll comprising a cylindrical core, a cylindricallayer of substantial thickness of soft resilient material fitted on saidcore, and a series of narrow rings of rigid material arranged side byside and tted on said soft layer, each said ring having plane parallelside faces in face-to-face contact with the next adjacent rings, t-heouter circumferential faces of said rings together normally presenting acylindrical surface, said lip of the trough presenting a vertical flatface to the surface of the roll, said flat face having a vertical widthas great -as the maximum downward displacement of said rings resultingfrom pressure on top thereof.

References Cited by the Examiner UNITED STATES PATENTS 3/1909 Scott29-125 X 3/1949 Hooper 29-125 X

